Panasonic Intellectual Property Management Co., Ltd.

Naoki Sawada

Taiki Nishimoto

Noriaki Takeda

A power conversion apparatus is provided with a transformer, a primary circuit, and a secondary circuit. The primary circuit is connected to a primary winding of the transformer, has a primary positive bus and a primary negative bus, and includes at least one switching element. The secondary circuit is connected to a secondary winding of the transformer, has a secondary positive bus and a secondary negative bus, and includes at least one switching element. The power conversion apparatus is further provided with a coupling circuit including at least a first capacitor. The power conversion apparatus is configured such that the primary circuit is an unbalanced circuit and the secondary circuit is a balanced circuit, and having the coupling circuit connected between a center tap of the secondary winding of the transformer, and one of the primary positive bus and the primary negative bus.

Power conversion apparatus including transformer and operable with reduced common mode noise

A switching power supply apparatus has a line-to-ground capacitance Cbetween a first winding terminal of a transformer and a conductor portion, and a line-to-ground capacitance Cbetween a second winding terminal of the transformer and the conductor portion. The switching power supply apparatus is provided with a capacitor being connected between a first output terminal of a switching circuit and the first winding terminal of the transformer, and a capacitor being connected between a second output terminal of the switching circuit and the second winding terminal of the transformer. Capacitances of the capacitors C, Care set to satisfy: C>C, for C>C; C=C, for C=C; and C<C, for C<C

Switching power supply apparatus for reducing common mode noise due to line-to-ground capacitances

A switching power supply apparatus is provided with a switching circuit and an even number of transformers. The transformer are provided with: cores each having an identical shape; primary windings each having an identical arrangement around the cores, and each having first and second terminals; and secondary windings each having an identical arrangement around the cores, and each having third and fourth terminals. The primary windings of the transformers are connected so that when a current flows from the first terminal to the second terminal of a first transformer, a current flows from the second terminal to the first terminal of a second transformer. The secondary windings of the transformers are connected so that when a current flows from the third terminal to the fourth terminal of the first transformer, a current flows from the fourth terminal to the third terminal of the second transformer.

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Osaka, Japan

Naoki Sawada